Free · Substack Oct 27, 2026 · 1 min read

Afternoon update

$NBIS rose 10.78% Tuesday as AI-infrastructure names rallied after Anthropic's preliminary IPO filing, while refiners took the other side of the…

Afternoon update
Intraday Movers · Afternoon · Intraday Movers — October 27 AFTERNOON · Tue, Oct 27

$NBIS rose 10.78% Tuesday as AI-infrastructure names rallied after Anthropic's preliminary IPO filing, while refiners took the other side of the tape.

  • Nebius (+10.78%, $40.8B) and Astera Labs (+9.86%, $49.3B) advanced on Anthropic's preliminary IPO filing and a lender group's agreement to finance a $63B purchase of Broadcom AI chips for Anthropic.
  • Cerebras rose 9.89% after Oracle said it will add Cerebras hardware for AI inference on Oracle Cloud Infrastructure starting in the first half of 2027.
  • AMD gained 5.44% on heavy volume after committing a $1B investment in Meta's equity offering under an expanded AI-infrastructure partnership; Nvidia is investing $3B in the same raise.
  • Refiners fell as crude climbed on an Iran/Israel risk premium: Valero -8.18%, Marathon Petroleum -6.62%, Phillips 66 -6.25%, with PSX reporting Q3 before Wednesday's open.
  • Breadth: semiconductors +2.83% with 11 of 11 higher; oil and gas -3.33% with 0 of 7 higher. SMH +2.93%, XLE -1.89%.

Valero's history offers context: across 38 drops of 8% or more in 19.8 years, 62% were higher three months later, at a median +16.4%. Wednesday's Phillips 66 results will show whether margin pressure is showing up in reported numbers.

Not financial advice. For informational and educational purposes only.

Originally published on the Position Tracker Substack. Read on Substack ↗

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